Balance-staff for watches.



H. B. LINDSEY.

BALANCE STAFF FOR WATCHES,

APPLICATION FILED JAN. 3. 1916.

1,202,075. Patented Oct. 24,1916.

Evan/tor:

HUGH BENJAMIN LINDSEY, OF ORCHARDS, WASHINGTON.

BALANCE-STAFF FOR WATCHES.

Specification of Letters Patent.

Patented Oct. 24:, 1916.

Application filed January 3, 1916. Serial No. 70,084.

Y '0 all whom it may concern:

Be it known that I, HUGH BENJAMIN LINDsnY, a citizen of the UnitedStates, residing in Orchards, in the county of Clarke, in the State oflVashington, have invented new and useful Improvements in Balance-Stafis for WVatches, of which the following is a specification.

Hy invention relates to staffs on which the balance Wheels of watchesare mounted.

The object of my invention is to produce a staff for the balance Wheelsof watches made of separable parts and which may be of different sizesand designs for interchangeable use in the repair and replacement ofsuch parts.

To these ends my invention includes the combination and arrangement ofcomponent parts to be hereinafter described and more particularlypointed out in the claim.

In the accompanying drawings, in which like characters indicate similarparts, Figure 1 is an elevation of my balance staii, and Fig. 2 is asimilar View showing parts thereof in cross section.

My invention includes, generally, a staff or spindle having a thickenedlower portion, a projecting screw-threaded stem, a hub loosely carriedon said stem and a cap screwed upon the outer end of the stem, adaptedto clamp the hub between its lower face and the thickened portion of thestaff.

Referring now to the drawings, 1 indicates my spindle or staff havingthe projecting screw-threaded stem 2, and as shown by the drawings, isprovided with a beveled shoulder 3 at the point from which the stemextends from the stafi. Loosely carried upon said stem is provided thehub 4 having a cutaway portion 5 and annular shoulder 6 adjacent to itsupper end, upon which may be mounted a balance wheel. Said hub iscentrally bored and adjacent to each end of the bore is provided withcupped portions 7 and 8 adapted to register with the shoulders on thestafi 1 and cap 9, respectively.

As shown in the drawings, the hub at is clamped upon the stem 2 by thecap 9 screwed upon the outer end of the stem and provided with theprojecting and beveled lips 10, which register with the cupped portion 8of the hub and are coincident in size and shape therewith, the cap beingadapted, when the cap is screwed tightly upon the stem, to clamp the hubrigidly in position on the staff. The staff of my invention, when thusassembled, is inserted in its proper place in the structure of a watch,and it will be appreciated that if injury occurs to any of the parts orto the balance wheel carried thereon, the cap may be readily removed andthe parts conveniently disassembled or replaced by similar parts whichmay be carried in the stock of a watch maker, without any inconvenienceto the watch maker or injury to the delicate parts of the watch that arerequired to be removed.

Having thus described my invention, What I claim as new and desire to besecured by Letters Patent is A balance stall for watches, comprising aspindle having a trunnion at one end and a screw-threaded stem integraltherewith, a shoulder on the spindle intermediate of its ends, a smoothbored hub loosely carried on the stem having a cupped portionsurrounding each end of the central bore, a screw-threaded capcomprising a trunnion carried thereon and a projecting shoulder on thecap surrounding its center bore adapted to rigidly secure the hub on thestem, said shoulder on the spindle and shoulder on the cap coincidingwith the cupped portions of the hub, substantially as described.

HUGH BENJAMIN LINDSEY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patent: Washington, D. G.

